Dear Mai,
I want to make a small announcement that next week is my birthday, and it would be great if you can take your time and join us for a small party at my house. It will be started at 5pm and maybe ended early around 9pm, so I hope it is a suitable time for you and everyone. There will be birthday cake, delicious dishes that are made by my mom, and a lot of candies at the party. We can eat and play a lot of fun games afterwards.
Call me if you cannot make it to my party
I am looking forward to hearing from you soon
Love,
Nha.